Water-tube boiler.



unteren WILLIAM D. HXIE, DE NEWYRH, li'. Y.,

COMPANY, Ol? BAYNNE, NEW JERSEY, A

ASSGlTR Tl) THE BABCQCK el. "WILGOX GRPORATXON F NEW JERSEY.

Lieselot( specification of 'Letters Patent.

inatented July if, lille.

.llpplicatlonille January' "l, 1912. Serial No. $20,750.

is a specification.

My invention relates `to a watei` tube boiler and will be understood by reference to the following,r description taken in connection with the acoornpanying,r drawings in which Fivure l is a view 1n )art elevation and in c u c n --I part transverse section, oi. a boiler embody@ lng the invention; Fig. 2 a central longitudinal section ot Fig. l; Fig. '3 a transvew..v

section to illustrate a modification 'in winch the boxes into which the generating tubes are expanded extend transversely instead of longitudinally of the banks olA tubes;'l `ig. a view of a portion. of two oi the boxes ot Fig. with the hund. hole covers removed;

' Fig. 5 a transverse section of prises two units, 1 and 2 another noodiiication; and Fig. (3 is a side View of a portion of Fig. 5 looking in the direction ol the arrow.

Similar reference numerals lar parts in the several views.

Several of the features hereinafter scribed are applicable to a boiler of a single unit and l wish to be understood not limiting myself to a boiler comprising; two units disposed relative to each other as shown in the drawings, unless it is speciii cally so claimed. y As shown in Figs. l end 2, the boiler conisyminetrically disposed Witli reference to the central longitudinal plane of the setting, each unit coinprising; -abank of inclined water tubes, the banks beingA inclined so as to converge toward each other upwardly to provide a relatively large Aehaped combustion chain ber 3 between them. The boiler may be `fired with oil, burners fl being shown for that purpose. -The method oi? tiring is, however, not material, as the boiler may be set over a coal fired furnace.. The tubes oil both banks are expanded at their upper ends into a central longitudinal steam and water drum 5, and at their lower ends into water indicate siniiboxes (i ofy relatively small transverse seetion, `the tubes being preferably staggered to prevent lanes and to cause the products of combustion to be broken up in their passage across the tube surfaces. The water boxes (i are placed at right angles to the axes of the tubes at their lower ends and when adjacent to each other forni practically a continuous .vater wall and tube sheet. Theymay' extend either longitudinally or transversely of the setting, the foi-nier arrangement being shown in Figs. l and 2, with two longitudinal rows of tubes to a box. ln thewall opposite the tube ends are hand holes 7 through ing box may be inspected.

which access to the box may be had for expanding; the tube ends. Also one or both ends of each box (S isa hand hole 8 through which the entire interior of the/'correspond- At either or both ends of the 'water boxes A is transverse box l) o approximately the saine section as the boxes and connected to the latter by tubes or nipples. These transverse boxes 9 act as blowoii2 collectors through which the boiler may be entirely drained, or may serve to sup ply additional Water for circulation. The

side Walls l@ are built up to the lower row of tubes ll of each bank to protect the undersides ci1 the loweirnost boxes and the side walls l2 extend 'from the uppermost box 6 to the uptakes, the boxes 6 being supported at their ends on brackets or saddles on they-lates 13 at the front and rear of the setting. The hand hole sides oi the boxes G are therefore readily accessible, the boxes running lengthwise or crosswise oi theboiler at a convenient height above the floor line.

In some designs ol' Water tube boilers hav- -ing inclined generating tubes, the lower ends ofthe tubes are expanded into water drums. -These drums are oit small diameter and it is an exceedingly' dii icult matter to expand the lower ends oi the'tubes into the tube sheet, and when necessary to :renew a tube sheet the cost is large as the entire bank of tubes is destroyed. The present design, employing a plurality oi' boxes 6, presents a distinct advantage in that a defective box can be replaced at small expense, it being only necessary to renew the generating tubes enpanded into that box. Any Work to be done on the lower tube ends can be performed by the operator in the ample space provided at the sides of the boiler outside of the walls 10, and the work cany be much more electively done than if the workmen were compelled to squeeze into a small water drum where the space is greatly confined or a drum so small as to prevent access altogether. Also by the use-of boxes all riveted joints are eliminated in'the pressure parts located at the lower parts of the boiler. At the extreme end of each longitudinal box 6 I provide tubes 14 to act as a down-comer or water supply to. the lower boxes.

As shown in the drawings, the lgenerating tubes areperfectly straight for t eir entire length except at their upper ends where they are curved for a short distance in order that they may enter the steam and water drum 5 radially. An advantage incident to such form of tube is that the entire interior of the tubes can be seen when examined from both ends and also thoroughly cleaned when necessary. Transverse battles 15 and 16 can be readily placed in the banks, the former across the uptake ends of the tubes, and the latter approximately midway between the baille 15 and the boxes` 6. In addition to these baliies I provide a longi tudinal baflie 17 among the lower tubes of each bank, said bailles extending from the boxes 6 upwardly to the first pass, thus forming the inclined vsides of the A-shaped combustion chamber which chamber is open to the gases or products of combustion onlyA along thevupper parts of its sides, that is atthe upper ends .of the tubes. Supported on Ithe outside row of tubes of each bank is a baiiie 18 extending from the steam and water drum 5 downwardly to the crossbailie 16. By the system of baffles employed separate portions of the gases are caused' to travel across and around the tubes, as indicated by.

, the arrows, to the separate outlet tlues 19 ,thereby prolonged.' If desired, the

and 20.- It will 'be noted that the boxes 6 above the baffles 17 are exposed onlp to the heat of the 'escaping gases, their li tudinal baffle 17 may besupported on the lowermost row of tubes andextend from the side Walls 10 to the first pass, thus putting all of the boxes in the coolest art of the boiler, in which case the cross ba e 15 would extend from the lowemost row of tubes of the two banks.

' In Figs. 3 and 4 I have shown a modification inwhich the lower ends of the generatin tubes areexpanded into boxes 21 exten ing transversely of the bank instead of longitudinally as shown in Figs. 1 and 2.

These transverse boxes may be in the form of headers'corrugated so as to stagger the tubesY for the same' purpose that they have been described as staggered. in connection e being; longiwith Fig. l. All the advantages incident to accessibility by placing the hand hole sides of the boxes 21 outside of the side walls ofthe setting apply as in the case of the longitudinal boxes. 22 is nippled to the lower ends of boxes 21.

In Figs. 5 and 6 I have shown another modification in which the lowermost box 21 in Fig. 3 is replaced by a box 23 extending longitudinally of the boiler and transverse of the boxes 21, and connected by pipes or nipples 24 to the lower ends of all of the boxes 21. In this form the longitudinal bailes 17 are supported on the row of tubes expanded into each of the boxes 23.

What I claim and desirev to secure by Letters Patent of the United States, is

y1. A water tube boiler'comprising a bank of inclined water tubes, a steam and water drum into .which the upper ends of said tubes are expanded, boxes ixtowliich the lowerends of the tubes are expanded in groups or rows, said tubes bein curved at their upper ends and straight or the rest of their length, and a blow-off collector box connected to the boxes into which the tube ends are expanded.. l

2. A water tube'boiler comprising two lunits each consisting of-a -bankrof water tubes inclined toward each other upwardly to form between them anAyshaped combustion chamber, a central steain and water drum into which the upper ends of the tubes of bothbanks are expanded, and a plurality of boxes into which the lower ends of the tubes are expanded in roups or rows, said tubes beingcurved at t eir upper ends and straight for the rest of their' length, andy boxes into which the ower ends of the tubes A blow-olf connection' upper ends ofthe tubesof both banks are expanded, a plurality of are expanded in groups or rows, downcomers connecting thel water s ace of said drum with said-boxes,'and a b ,ow-off collector box connected to the boxes into which the tube ends are expanded.

In a water tube boilerq comprising two umts each consisting of a bank of water tubes inclined toward each other upwardly to form between them an ff-shaped combustion chamber, a central steam and water drum into which the upper ends of the tubes ,of both banks are expanded, a plurality of 4vboxes into which the lower ends' of the tubes are expanded, in groups or rows, said tubes being` curved at their upper ends and straight for the rest of their length, trans- Mmmm vex'se baf'es divi-ding each bank into a lphimlity of passes and longitudnalbaies extending from said boxes to the' rst pass and from the steam and water drum to thenlast passi and a blow-off 4collector box connected to the boxeS into which the tube ends are 'exhmue.

scribing winesses.

WILLIAM D. HOXH'. 

